Pseudoscalar pole terms in the hadronic light-by-light scattering contribution to muon $g - 2$

The pseudoscalar pole contribution is the dominant source of the ${\cal O}(α^3)$ hadronic light-by-light scattering effect in muon $g - 2$. We have examined this contribution taking account of the off-shell structure of the pseudoscalar-photon-photon anomaly vertex deduced from available experimental data. Our work leads to an improved estimate, $-79.2 (15.4) \times 10^{-11}$, for the total hadronic light-by-light scattering contribution to the muon $g - 2$.

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